<?php
/**
 * Slipstream :: Highly adaptive dependency injection framework
 * Copyright 2010-2011 Ian Unruh (Xerof3ar)
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
namespace Slipstream\Configuration;

use Slipstream\Configuration\Option\PredicatedOption;
use Terrafirma\Predicate\InstanceOfPredicate;

/**
 * 
 * 
 * @author Ian Unruh (Xerof3ar) <ianunruh@gmail.com>
 * @since Class avaliable since release 1.0
 */
class AliasPolicy extends AbstractPolicy
{
	// {{{ Policy options
	/**
	 * @desc Context that this context is an alias of
	 * @type ContextInterface
	 * @default null
	 */
	const OPTION_CONTEXT = 'context';
	// }}} Policy options
	
	/**
	 * Called in the constructor to setup the options and their default values
	 * @return void
	 */
	protected function setupOptions()
	{
		parent::setupOptions();
		
		$this->set(self::OPTION_SCOPE, PolicyScope::Reference());
		
		$this->addOption(new PredicatedOption(
			self::OPTION_CONTEXT, 
			new InstanceOfPredicate('Slipstream\Configuration\ContextInterface')));
	}
}